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历来认为桃褐腐病的传染源仅仅是该病病果的果梗、枯枝、僵果及邻近的李树等核果类。最近日本冈山农事试验场病虫部发现,桃缩叶病病叶也是褐腐病的重要传染源。该部84年在预测圃中发现已落的和挂在树上的缩叶病病叶都有大量的褐腐病菌,尤其是缩叶病斑占叶面积二分之一以上的病叶形成的最多。同年在本县桃主要产地桃园的调查,也得到同样的结果。如从该县75～84年10年间桃缩叶病和褐腐病发病关系看,也表明桃缩叶病重的年
It has always been thought that the source of infection of peach rot is only the fruit stems, dead branches, dead fruits and the neighboring plum and other stone fruits of the disease. The recent Okayama Agricultural Experimental Pest and Disease Department found that peach leaf disease is also an important source of brown rot. In 1984, the department found that a large number of brown rot pathogens were found in the forested tree and the dwarf leaf hanging on the tree, especially the diseased leaf with more than one-half leaf area most. The same year in Taoyuan, the main producing area of the county, the survey also obtained the same result. As seen from the relationship between peach sclerotium and brown rot in the county during the past 10 years from 75 to 84 years,